chore: add sonnet-3.5 model
What does this merge request do and why?
Adds Anthropic sonnet-3.5 model, this will be needed for gitlab-org/gitlab#468334 (closed)
How to set up and validate locally
Numbered steps to set up and validate the change are strongly suggested.
Merge request checklist
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Tests added for new functionality. If not, please raise an issue to follow up. -
Documentation added/updated, if needed.